//es6模块化
import son from './sum';

//commonjs模块化
var minus = require('./minus');

//amd模块化
//require(['./muti'], function (api) {
//    console.log(api.muti(3, 4));
//});

let sum = son(4, 9);
let min = minus(9, 3);

console.log(sum);
console.log(min);